Category Archives: Learning

Wireless Continuous Wave Transmitter | Project 7/10 | Maxitronix 10in1 | In The Lab With Jay Jay

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This post is part of my video blog and you can find more information about this video on this show’s homepage which is here.

You can support this channel on Patreon: patreon.com/JohnElliotV

In this video I do the seventh Maxitronix 10in1 Electronic Project Lab project: Wireless Continuous Wave Transmitter.

While conducting this experiment I made some notes over here: Maxitronix/10in1/7.

I made a bunch of mistakes while building and testing this circuit, and a lot of the footage I took didn’t make it into the final video. In particular in between the construction part of the video at the beginning, and the testing part of the video at the end, I added a ceramic capacitor at the base of the transistor; I hadn’t understood the instructions to install this capacitor as it wasn’t wired in using spring terminals like all the other components.

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Following is a product I use picked at random from my collection which may appear in my videos. Clicking through on this to find and click on the green affiliate links before purchasing from eBay or AliExpress is a great way to support the channel at no cost to you. Thanks!

NOYAFA NF-521 Thermal ImagerThis is an image of the product.notes

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1-Transistor Radio | Project 5/10 | Maxitronix 10in1 | Learning Electronics In The Lab With Jay Jay

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This post is part of my video blog and you can find more information about this video on this show’s homepage which is here.

You can support this channel on Patreon: patreon.com/JohnElliotV

In this video I do the fifth Maxitronix 10in1 Electronic Project Lab project: 1-Transistor Radio.

This is the second radio circuit and just like the previous radio circuit I wasn’t able to make this one work either! But at least this time I did get some static noise out of the circuit, which was better than the “nothing” which I got out of the previous circuit.

Also, I did learn how to setup a frequency measurement on my oscilloscope: Measure -> Add -> Freq. Easy peasy! :)

Thanks very much for watching! And please remember to hit like and subscribe!

Following is a product I use picked at random from my collection which may appear in my videos. Clicking through on this to find and click on the green affiliate links before purchasing from eBay or AliExpress is a great way to support the channel at no cost to you. Thanks!

Scotch Titanium ScissorsThis is an image of the product.notes

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Standard Aussie home television aerial RF coaxial connector

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Man I had a lot of trouble figuring out what these things are called. I can tell you that they are not called F-Type, BNC, SMA, N-Type, or PL-259 connectors. In the I end I asked about this and learned these connectors are called Belling-Lee connectors, also known as IEC 169-2 Female/Male. But if you search for “IEC connector” (which these things are apparently sometimes called) you will only find the power adapters, not these aerial connectors.

New Book Teardown #1: The Art of Electronics 3rd Edition (2015) | In The Lab With Jay Jay

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This post is part of my video blog and you can find more information about this video on this show’s homepage which is here.

You can support this channel on Patreon: patreon.com/JohnElliotV

Silly Job Title: Charge Charmer

This video is part of the New Book feature of my video blog.

In this video I review the venerable The Art of Electronics 3rd Edition by Paul Horowitz by Winfield Hill published in 2015. This monstrous tome includes some 1,220 pages.

This is a long video, because this is a long book!

While I was writing up these notes for the video I found a wealth of fun stuff. Here are a few links:

Thanks very much for watching! And please remember to hit like and subscribe!

Following is a product I use picked at random from my collection which may appear in my videos. Clicking through on this to find and click on the green affiliate links before purchasing from eBay or AliExpress is a great way to support the channel at no cost to you. Thanks!

Plato Model 170 Wire CutterThis is an image of the product.notes

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PHP shutdown handlers and exit codes

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I was in bed trying to get to sleep but my brain wanted to know the answer to this question. So I was forced out of bed to write this experiment:

function main( $argv ) {

  register_shutdown_function( 'shutdown_1' );
  register_shutdown_function( 'shutdown_2' );

  exit( 0 );

}

function shutdown_1() {

  exit( 1 );

}

function shutdown_2() {

  exit( 2 );

}

main( $argv );

With this PHP code, what do you expect is the resultant error level?

The answer is ‘1’. After main() calls exit( 0 ) the shutdown function shutdown_1() is invoked. When shutdown_1() calls exit( 1 ) the process exists and shutdown_2() is never called.

I’m glad we cleared that up. Back to bed.